Class Middleware

tests/test_web_middleware.py:442–451

        return web.Response(body=b"OK")

    class Middleware:
        async def __call__(self, app, handler: Handler):
            async def middleware(request):
                resp = await handler(request)
                assert 200 == resp.status
                resp.set_status(201)
                resp.text = resp.text + "[old style middleware]"
                return resp

            return middleware

    with pytest.warns(DeprecationWarning) as warning_checker:
        app = web.Application()